Importing Custom Primitive Data in USD

I am bringing a large USD city set in Unreal. All the walls and buildings are using the same material but I would like to introduce some variations in each individual mesh instance. With regular uassets in unreal, I can assign Custom Primitive Data on the mesh. Does the USD stage support importing Custom Primitive Data baked into the USD files in another DCC? If so, what is the name and type of the attribute?

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